TM 11-6625-3081-237-38. PORTABLE VIDEO MONITOR7-38INPUT CODE: VIDEOSTa .DESCRIPTIONThis module tests the portable video monitor.The portable monitor is firstchecked for uniform brightness.The operator is prompted to observe the portablemonitor for uniform brightness over the entire screen, and to press yes if thebrightness is acceptable and no if it unacceptable. If unacceptable, the operatoris prompted to replace portable monitor.The operator is prompted to place the FULL UNDER switch to the UNDER positionand adjust the HEIGHT control until the vertical and horizontal borders are aboutthe same on all four sides.The operator is prompted to press yes if acceptable andno otherwise.If no, the operator is prompted to replace the portable monitor.The operator is next prompted to place the FULL UNDER switch to the FULLposition and verify that the display is now completely illuminated and the borderhas been completely removed.The operator presses yes if the display is completelyilluminated, no otherwise.If no, the operator is prompted to replace the portablemonitor.The operator is next prompted to observe that a fine vertical bar pattern isvisible on the monitor and to press yes if the image is acceptable and no if theimage is unacceptable.If no, the operator is prompted to replace the portablemonitor.b. REPLACEMENT PROCEDURE REFERENCEReplacement procedures for portable monitor are not provided in this manual.c .ERROR MESSAGESThe following is a list of error messages associated with portable video monitortest.1. VIDEO-MONITOR GREYSCALE TEST FAILED.2. VIDEO-MONITOR FLAT-FIELD PATTERN TEST FAILED.3. MONITOR UNDER SIZE PATTERN TEST FAILED.4. MONITOR FULL SIZE PATTERN TEST FAILED.5. 10 MHz BAR PATTERN TEST FAILED.d. CORRECTIVE ACTION - VIDEOSTRemove portable video monitor. Check cables and connectors and repair asrequired.Install replacement portable video monitor and perform VIDEOSTtest.If VIDEOST test passes, no further action required. If VIDEOSTcontinues to fail, next higher level of maintenance required.7-205/(7-206 blank)